Samsung · Oven Serious

C-31 — High Temperature Around Main PCB

The control board is reading excess ambient temperature in its own compartment. Usually a cooling/airflow problem rather than a board defect.

Keep using it?
Limited use only
DIY difficulty
Moderate
Checked against
manualslib.com manufacturer manual seen via a third-party republisher, which we do not link — re-sourcing to the manufacturer is pending

How to fix it

  1. Let the oven cool completely before testing.
  2. Confirm the cooling fan spins freely and runs during bake — replace if open or seized.
  3. Clear any blocked oven vent (see C-24).
  4. For built-in wall ovens, verify the cutout meets Samsung's required clearance per the install manual.
  5. Inspect cavity insulation behind the control panel for displacement.
  6. If airflow and fan are good and the code returns, replace the main control board.

Why it happens

Typical signs: C-31 after long bake or self-clean · Control panel feels unusually hot · Cooling fan sounds weak or stopped · Code clears after a long cooldown

  • Failed PCB cooling fan Fan motor open or seized.
  • Blocked oven vent Hot air diverted toward the control compartment.
  • Insulation displaced Cavity insulation shifted, exposing PCB area to cavity heat.
  • Built-in wall oven cabinet without required clearance Install cabinet too tight, trapping heat.

Parts you may need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

  • Samsung oven cooling fan motor Common replacement
    Amazon →

More Samsung oven codes

---- ---- — Invalid Temperature Setting -dC- -dC- — Flex Duo Divider Missing or Removed -dE- -dE- — Flex Duo Divider Not Installed bAd LinE bAd LinE — Bad Power Connection C-10 Range C-10 — Temperature Sensor Reading Error C-20 C-20 — Oven Temperature Sensor Open/Short

All Samsung codes → All oven codes →

Frequently asked questions

What does the C-31 code mean on a Samsung oven?

The control board is reading excess ambient temperature in its own compartment. Usually a cooling/airflow problem rather than a board defect.

What causes the C-31 code on a Samsung oven?

Failed PCB cooling fan: Fan motor open or seized. Blocked oven vent: Hot air diverted toward the control compartment. Insulation displaced: Cavity insulation shifted, exposing PCB area to cavity heat.

Is it safe to keep using a Samsung oven with a C-31 error?

Limited use only. This is rated a serious-severity fault.

How do I fix C-31 on a Samsung oven?

Let the oven cool completely before testing. Confirm the cooling fan spins freely and runs during bake — replace if open or seized. Clear any blocked oven vent (see C-24).

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. How we verify: manualslib.com — manufacturer manual seen via a third-party republisher, which we do not link — re-sourcing to the manufacturer is pending.